Which One of the Following Contributes to the Utility of the Strains

question 101

Multiple Choice

Which one of the following contributes to the utility of the strains of Salmonella typhimurium used in the Ames reversion assay?

• A)They are highly permeable to test substances.
• B)They are defective in DNA repair and,therefore,cannot readily repair damage done by the test substances.
• C)It is very straightforward to assay the conversion of their histidine auxotrophy mutations to histidine prototrophy.
• D)All of the choices are correct.

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Definitions:

Biological Classification

The scientific system of categorizing living organisms into hierarchical groups based on their evolutionary relationships and characteristics.

Species

A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding and are classified together as sharing a common lineage.

Mammals

Warm-blooded vertebrate animals characterized by the presence of mammary glands which females use to feed their young, as well as fur or hair.

Bodily Growth

Refers to the physical and developmental changes that occur in the human body throughout the lifespan, including changes in size, shape, and physical maturity.